Fix phasar research tool to enable container build

[boehmseb]

This PR enables Phasar to be built in a container.

@MMory @pdschubert: There are two things that should be changed in phasar's install-llvm.sh script for this to work properly:

• the script currently uses sudo for installation, this is not necessary when installing to a user-writeable directory (as we use here)
• Martin suggested using source tarballs instead of cloning llvm to speed up the process, especially since the build is done in a temporary directory

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01% ⚠️

Comparison is base (8c877d2) 68.20% compared to head (4c2a268) 68.20%.

Additional details and impacted files

@@             Coverage Diff              @@
##           vara-dev     #664      +/-   ##
============================================
- Coverage     68.20%   68.20%   -0.01%     
============================================
  Files           333      333              
  Lines         25680    25682       +2     
============================================
+ Hits          17516    17517       +1     
- Misses         8164     8165       +1     

Files Changed	Coverage Δ
varats/varats/tools/driver_build_setup.py	52.72% <ø> (ø)
varats/varats/tools/research_tools/phasar.py	40.19% <50.00%> (+0.19%)	⬆️

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[vulder]

Should we merge this after the phasar changes were worked in?

[vulder]

@fabianbs96 @boehmseb What's the current state of the phasar changes? Can we start to integrate this branch?

[boehmseb]

The only remaining issue is to decide how to handle the llvm install.
Phasar currently needs to be built against llvm 14.

The options are:

• make the user responsible for having the correct llvm version installed and only install llvm 14 by ourself when using containers
• always install llvm 14 by ourself
• make the llvm install configurable via CLI (probably not a good idea because this would require reserach-tool-specific command line options)

[vulder]

If we can easily switch to 14 it's probably the simplest thing to do, especially as our LLVM state is also 14.

[vulder]

@fabianbs96 @boehmseb What's the current state of this PR? We should resolve the llvm-14 issue to merge this one otherwise the branch will drift more and and more.